K&N MAF Sensor Urban Myths?
03-10-2008, 02:11 AM
#16
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Apologies to Mark Kibort .. while he's a weird bird, he is a good guy, and he didn't deserve this insult.
Last edited by heinrich; 03-10-2008 at 12:33 PM.
03-10-2008, 02:12 AM
#18
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" K&N always tells people the facts.”
Right, just like they still say that their filters give better gas mileage!
BS, as we have discussed before. Ive already proved that you get the best gas mileage by the dirtiest, clogged filter possible. At best, the filter has no influence in gas mileage results.
MK
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Right, just like they still say that their filters give better gas mileage!
BS, as we have discussed before. Ive already proved that you get the best gas mileage by the dirtiest, clogged filter possible. At best, the filter has no influence in gas mileage results.
MK
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http://www.knfilters.com/news/news.aspx?ID=422
"There are four words from a mechanic that should trigger a red flag for consumers, Mass Air Flow Sensor. A little knowledge about this “mystery” sensor can save hundreds of dollars and protect car warranties.
If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it’s not true. K&N has researched, tested and devoted many hours to confirm the use of K&N Air Filters, including over oiled air filters, will not cause a Mass Air Flow sensor failure under any remotely normal driving conditions.
K&N Engineering Mass Air Flow TestingOil does not come off K&N Filters. If a mechanic or dealership claims K&N is the problem there has to be proof. K&N will often work with consumers to recover money for repairs which legitimately should have been covered under the vehicle’s warranty where warranty coverage would otherwise have been available.
“We’ve tested Mass Air Flow sensors and discovered these parts are being replaced when they don’t need to be,” said K&N Senior Lab Manager Rich Dwyer. “Consumers are sometimes told readings from the Mass Air Flow sensor show it is saturated with oil from a K&N Filter. This is not true. Consumers should ask to see the Mass Air Sensor codes and/or get a second opinion.”
Discuss....
"There are four words from a mechanic that should trigger a red flag for consumers, Mass Air Flow Sensor. A little knowledge about this “mystery” sensor can save hundreds of dollars and protect car warranties.
If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it’s not true. K&N has researched, tested and devoted many hours to confirm the use of K&N Air Filters, including over oiled air filters, will not cause a Mass Air Flow sensor failure under any remotely normal driving conditions.
K&N Engineering Mass Air Flow TestingOil does not come off K&N Filters. If a mechanic or dealership claims K&N is the problem there has to be proof. K&N will often work with consumers to recover money for repairs which legitimately should have been covered under the vehicle’s warranty where warranty coverage would otherwise have been available.
“We’ve tested Mass Air Flow sensors and discovered these parts are being replaced when they don’t need to be,” said K&N Senior Lab Manager Rich Dwyer. “Consumers are sometimes told readings from the Mass Air Flow sensor show it is saturated with oil from a K&N Filter. This is not true. Consumers should ask to see the Mass Air Sensor codes and/or get a second opinion.”
Discuss....
03-10-2008, 03:05 AM
#19
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That rules me out and probably 3/4ths of other Listers.
03-10-2008, 08:09 AM
#20
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The problem comes when people over oil a cleaned K&N. The burn off cycle of the MAF is only designed to deal with very light deposits from the oil vapour than will often be present in the inlet.
The burn off can't deal with heavy oiling.
If a MAF sensor is badly soaked in oil, you may well be able to clean the surplus oil of with one of the cleaner/solvents that some people have reported using sucessfully.
The burn off can't deal with heavy oiling.
If a MAF sensor is badly soaked in oil, you may well be able to clean the surplus oil of with one of the cleaner/solvents that some people have reported using sucessfully.
03-10-2008, 10:44 AM
#21
I posted way back on this...but here's a summary... running at the drag strip..trying to break into the 13's...ran like 3 times..each one was 14.01 14.02..etc... Took out the stock filter ..and dropped in my K&N...and ran a 13.97..the next run...and the runs were all in a short period of time...spent more time changing the filter than it would have taken to get back up to the line. I've run K&N filters in both my 87S4 and my GT...no MAF failures while running the K&N to date..
03-10-2008, 11:11 AM
#22
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The basics are that if the filter is oiled in the field by someone from the more is better community there very likely could be a problem. I am attaching an Amsoil service bulletin, which points out that the oil used in this type of filter is "tackified" oil as is the K & N.
Amsoil runs the filters through a centrifuge to remove excess oil before being boxed. (One would assume that K & N does the same thing)
So new filters present a relatively low risk. Which puts us back to the over oiling issue.
Hopefully this will shed some light.
Best regards,
Ken
Amsoil runs the filters through a centrifuge to remove excess oil before being boxed. (One would assume that K & N does the same thing)
So new filters present a relatively low risk. Which puts us back to the over oiling issue.
Hopefully this will shed some light.
Best regards,
Ken
03-10-2008, 11:14 AM
#23
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Just one more thing......I always ran a stock filter up until the time I added the SC. But with the addition of the blower I am relegated to using something else.
Ken
Ken
Last edited by Vlocity; 03-10-2008 at 12:31 PM.
03-10-2008, 11:20 AM
#24
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Every scientific filter test comparing K&N to a stock paper filter on any vehicle has shown the K&N to capture less dirt and restrict airflow more than stock paper.
One of the best tests published: http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm
Most cars do not have the MAF directly under the filter. That may be the problem with oil and MAFs in 928s.
One of the best tests published: http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm
Most cars do not have the MAF directly under the filter. That may be the problem with oil and MAFs in 928s.
03-10-2008, 12:14 PM
#25
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Matt, I have always theorised that if you look at the actual paper surface where the airflow hits it, a stock filter offers a smooth surface, allowing the air to pass through .... looking at the K&N, there is a grid of chicken wire which, at the angle the air has to enter and pass through, is a very tight grid (viewed at an agle as if you were looking from the origin of the air flow). This (I theorise) causes turbulence and slows the air down, and frustrates the direction of air flow. Vacuum cleaners use the same paper our filters do.
Run air through a paper microfilter V.
Then run the same air through a V made of chicken wire, backed by a fuzzy fabric V.
Run air through a paper microfilter V.
Then run the same air through a V made of chicken wire, backed by a fuzzy fabric V.
03-10-2008, 12:19 PM
#26
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The problem is mass air flow sensors ALWAYS fail. Sooner or later they FAIL... Human nature being what it is we all try to explain ... why the sun rises in the morning , who created the earth , and what killed the mass airflow sensor.
03-10-2008, 12:32 PM
#28
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Tom, you and I know that the air flow is so sensitive as to jump in horsepower if ONE of the MAF screens is removed or added .... the K&N is a massive screen turned sideways.
03-10-2008, 12:33 PM
#29
BTW..just for the record..I think the screens are only there to protect the maf wire and keep extra large debris from entering the engine..
03-10-2008, 12:37 PM
#30
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IF: MAF screens are there to disrupt air flow
AND: K&N does the same thing
CONCLUSION: K&N has same effect as MAF screen
BUT: MAF screen lowers horsepower
CONCLUSION: K&N lowers horsepower